Wedge-shaped Pushing Device for Bridge and Construction Method Thereof

ABSTRACT

A wedge-shaped pushing device for bridge and construction method thereof includes a base, a lifter and a pushing mechanism. The top of the base has a platform with a wedge-shaped block; the wedge-shaped block has a top side formed into an upper slope; the top of the lifter has a pad; the pushing mechanism has an upper wedge-shaped seat, hydraulic cylinders and a support seat; the upper wedge-shaped seat has top with a cushion and a bottom formed into a lower slope; the hydraulic cylinder has a piston rod; the support seat has a top fixed and combined with the hydraulic cylinder by a pivot. By the wedge-shaped pushing device, the box girder can be displaced and pushed to achieve the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety of the displacement and pushing of the box girder.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a wedge-shaped pushing device for bridge and its construction method, and more particularly to the wedge-shaped pushing device for bridge and the construction method which are applied for displacing or pushing large steel bridges or prestressed concrete box girders and have the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety.

Description of the Related Art

In present large steel bridges or prestressed concrete box girders used for displacement and pushing, the box girder usually comes with a heavy weight over thousands of metric tons and thus cannot be moved by crane. Most of them adopt a push-pull method and use a temporary pier, lifter and rail to push, drag, or slide the box girder on a rail to a desired installation position.

However, the box girder uses the lifter to pull a steel cable to set a translational rail slip during the displacement and pushing. Due to the large friction force produced while pushing the static box girder, it needs more power for the traction and a larger horizontal force to overcome the static friction during the pushing and dragging operation. The temporary pier needs to be set separately, and the support of greater rigidity and the traction can be adjusted at any time, while each support point of the temporary pier or pier may be exerted with uneven forces and horizontal overloads that may crack the concrete of the piers, damage the equipment, or cause other issues that may affect the stability and safety of the pier structure for displacing and pushing the box girder.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to provide a wedge-shaped pushing device for bridge and its construction method to achieve the effects of displacing and pushing the box girder, lowering the construction cost, facilitating the installation, and improving the stability and safety.

The foregoing and other objectives of the invention are realized with a wedge-shaped pushing device for bridge that includes: a base, a lifter and a pushing mechanism, wherein the base has a platform disposed at a top side thereof, and the platform has a wedge-shaped block disposed on a side of the platform, and the top side forms an upper slope, and the bottom side is substantially in in horizontal shape and attached closely with the platform; the lifter has a pad disposed at the top end thereof; the pushing mechanism is installed on the other side of the platform and has an upper wedge-shaped seat, a plurality of hydraulic cylinders and a support seat, and the top side of the upper wedge-shaped seat has a cushion, and the bottom side of the upper wedge-shaped seat forms a lower slope, and the angle of the lower slope is matched with the angle of the upper slope; the hydraulic cylinder has a piston rod with an end coupled to the upper wedge-shaped seat; and an upper end of the support seat is fixed and combined with the hydraulic cylinder by a pivot, and the bottom of the support seat is attached closely with the platform.

According to the above-mentioned wedge-shaped pushing device for bridge, wherein the base, the wedge block, the pad and the support seat are made of a cement concrete material.

According to the above-mentioned wedge-shaped pushing device for bridge, wherein the base, the wedge block, the pad and the support seat are made of a metal material.

According to the above-mentioned wedge-shaped pushing device for bridge, wherein the cushion is made of a rubber material.

The other objective of the invention is to provide a wedge pushing construction method for bridge that comprises the steps of:

(a) setting a wedge-shaped pushing device under a box girder;

(b) adjusting a lifter to ascend and prop up the box girder;

(c) pushing the upper wedge-shaped seat onto the wedge-shaped block by a piston rod of a hydraulic cylinder, such that a lower slope and an upper slope are attached with each other, and a pad and a cushion are substantially leveled to support the box girder; and

(d) adjusting the lifter to descend, supporting the box girder by a cushion, pressing and controlling the hydraulic cylinder by the weight of the box girder to support the upper wedge-shaped seat, and sliding down the upper wedge-shaped seat along the upper slope in order to displace and push the box girder.

According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the wedge block and the pad are made of a cement concrete material.

According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the wedge block and the pad are made of a metal material. According to the above-mentioned wedge-shaped pushing construction method for bridge, wherein the cushion is made of a rubber material.

Based on the above arrangement, the box girder can be displaced and pushed by the device to achieve the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety of displacing and pushing the box girder.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an embodiment of the present invention;

FIG. 2 is an exploded view of an embodiment of the present invention;

FIG. 3 is a top view of an embodiment of the present invention;

FIG. 4 is a top view of a wedge-shaped pushing device and a box girder of an embodiment of the present invention;

FIG. 5 is a first schematic view showing the movement of an embodiment of the present invention;

FIG. 6 is a second schematic view showing the movement of an embodiment of the present invention;

FIG. 7 is a third schematic view showing the movement of an embodiment of the present invention;

FIG. 8 is a fourth schematic view showing the movement of an embodiment of the present invention;

FIG. 9 is a schematic view showing the displacement and pushing of a box girder in accordance with an embodiment of the present invention; and

FIG. 10 is a flow chart of a construction method in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The adopted technical means and achievable effects of the present invention will be apparent with the detailed description accompanied with related drawings of preferred embodiments as follows.

With reference to FIGS. 1 to 3 for a wedge-shaped pushing device 1 in accordance with an embodiment of the present invention, the wedge-shaped pushing device 1 comprises: a base 2 made of a cement concrete or a metal material, and having a platform 20 at the top, and the platform 20 having a wedge-shaped block 21 made of a cement concrete or a metal material and disposed on a side of the platform 20, and the top side is formed into an upper slope 22, and the bottom side is in a horizontal state and attached closely with the platform 20;

a lifter 3 (such as a jack), having a pad 30 at its top end, and the pad 30 is made of a cement concrete or a metal material and can increase the support area; and

a pushing mechanism 4, installed on the other side of the platform 20, and having an upper wedge-shaped seat 40, a plurality of hydraulic cylinders 41 and a support seat 42, and the top side of the upper wedge-shaped seat 40 having a cushion 43 made of a rubber material and capable of reducing the impact force of the weight, and the bottom side being formed into a lower slope 44, and the angle of the lower slope 44 being matched with the angle of the upper slope 22; and the hydraulic cylinder 41 having a piston rod 45 with an end coupled to the upper wedge-shaped seat 40; the support seat 42 having a top end fixed and combined with the hydraulic cylinder 41 by a pivot 46 and a bottom closely attached with the platform 20, and the pivot 46 being adjustable according to the angle of elevation of the hydraulic cylinder 41.

In FIGS. 4 to 9, when it is necessary to displace or push the box girder A, the wedge-shaped pushing device 1 is set under the box girder; the lifter 3 is adjusted to ascend and prop up the box girder A; the piston rod 45 of the hydraulic cylinder 41 pushes the upper wedge-shaped seat 40 onto the wedge-shaped block 21, so that the lower slope 44 and the upper slope 22 are attached to one another, and the pad 30 and the cushion 43 are leveled to support the box girder A; the lifter 3 is adjusted to descend, and the cushion 43 supports the box girder A, and the weight of the box girder A presses and controls the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, and the upper wedge-shaped seat 40 slides down along the upper slope 22 to displace or push the box girder A, so as to achieve the effect of lowering the construction cost, facilitating the installation, and improving the stability and safety of displacing and pushing the box girder A.

With reference to FIG. 10 for a construction method in accordance with an embodiment of the present invention, the construction method includes the steps of: (a) setting the wedge-shaped pushing device 1 under the box girder A; (b) adjusting the lifter 3 to ascend and prop up the box girder A; (c) pushing the upper wedge-shaped seat 40 onto the wedge-shaped block 21 by the piston rod 45 of the hydraulic cylinder 41, so that the lower slope 44 and the upper slope 22 are attached to one another, and the pad 30 and the cushion 43 are level to support the box girder A; (d) adjusting the lifter 3 to descend and prop up the box girder A by the cushion 43, and using the weight of the box girder A to press and control the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, such that the upper wedge-shaped seat 40 slides down along the upper slope 22 to displace and push the box girder A, and repeating the aforementioned steps until the box girder A arrives at the required construction position.

A circuit control is electrically connected to the lifter 3 and the hydraulic cylinder 41 for synchronous operations. When the weight of the box girder A presses and controls the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, the upper wedge-shaped seat 40 slides down along the upper slope 22 to displace and push the box girder A, so as to achieve the effects of lowering the construction cost, facilitating the installation, and improving the stability and safety of displacing and pushing the box girder A.

In summation, the present invention has the following advantages:

1. The wedge-shaped pushing devices 1 are set under the box girder A without requiring any rail or temporary pier, and the wedge-shaped pushing device 1 has the features of simple structure, convenient installation and moving, low construction cost, and reduced construction time.

2. The piston rod 45 of the hydraulic cylinder 41 is used to push the upper wedge-shaped seat 40 onto the wedge-shaped block 21, so that the lower slope 44 and the upper slope 22 are attached to each other, so that the bearing capacity and stability of pressing by the weight of the box girder A are improved.

3. The weight of the box girder A presses and controls the hydraulic cylinder 41 to prop and support the upper wedge-shaped seat 40, and the upper wedge-shaped seat 40 slides down along the upper slope 22, so that the stability and safety of displacing and pushing the box girder A are improved.

While the present invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claim. 

What is claimed is:
 1. A wedge-shaped pushing device for bridge, comprising: a base, a lifter and a pushing mechanism, wherein the base has a platform disposed at a top side thereof, and the platform has a wedge-shaped block disposed on a side of the platform, and the top side forms an upper slope, and the bottom side is substantially in in horizontal shape and attached closely with the platform; the lifter has a pad disposed at the top end thereof; the pushing mechanism is installed on the other side of the platform and has an upper wedge-shaped seat, a plurality of hydraulic cylinders and a support seat, and the top side of the upper wedge-shaped seat has a cushion, and the bottom side of the upper wedge-shaped seat forms a lower slope, and the angle of the lower slope is matched with the angle of the upper slope; the hydraulic cylinder has a piston rod with an end coupled to the upper wedge-shaped seat; and an upper end of the support seat is fixed and combined with the hydraulic cylinder by a pivot, and the bottom of the support seat is attached closely with the platform.
 2. The wedge-shaped pushing device for bridge according to claim 1, wherein the base, the wedge block, the pad and the support seat are made of a cement concrete material.
 3. The wedge-shaped pushing device for bridge according to claim 1, wherein the base, the wedge block, the pad and the support seat are made of a metal material.
 4. The wedge-shaped pushing device for bridge according to claim 1, wherein the cushion is made of a rubber material.
 5. A wedge pushing construction method for bridge, comprising the steps of: (a) setting a wedge-shaped pushing device under a box girder; (b) adjusting a lifter to ascend and prop up the box girder; (c) pushing the upper wedge-shaped seat onto the wedge-shaped block by a piston rod of a hydraulic cylinder, such that a lower slope and an upper slope are attached with each other, and a pad and a cushion are substantially leveled to support the box girder; and (d) adjusting the lifter to descend, supporting the box girder by a cushion, pressing and controlling the hydraulic cylinder by the weight of the box girder to support the upper wedge-shaped seat, and sliding down the upper wedge-shaped seat along the upper slope in order to displace and push the box girder.
 6. The wedge-shaped pushing construction method for bridge according to claim 5, wherein the wedge block and the pad are made of a cement concrete material.
 7. The wedge-shaped pushing construction method for bridge according to claim 5, wherein the wedge block and the pad are made of a metal material.
 8. The wedge-shaped pushing construction method for bridge according to claim 5, wherein the cushion is made of a rubber material. 